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Unformatted text preview: = Exam 2 PHYSICS 241 October 27, 2008 E Firstname ] l 3; Lastname SQ] 12+! Q5 I Section # TA’s Name _ You must start all problems from the equations on the sheet.
. You must show all work to get full credit for the problem. If you need more space, you may use the back of the sheet. If you do so, make sure that
you put an arrow indicating that. Do not get hung up on algebra. It is only worth a small fraction of the points. Do not Spend too much time on any one problem. The point values are listed for each
question so you can make efﬁcient uSe of your time. Some problems may involve several steps. Even if you can’t ﬁgure out all of them, write
down what you do know. You can also explain in words what to do. For example “If I could
ﬁnd the time t (which I don’t know how to do) I would use it in this equation to ﬁnd blank...”. The phrase “in terms of whatever variables...‘ certainly implies that you must use variables
given in the statement of the problem. You cannot have variables in the ﬁnal answer which
depend upon each other. For example, you can’t have a velocity v in your ﬁnal answer if it
can be expressed in terms of the time t which you also have in the ﬁnal answer. Lastly, you
answer can obviously include any needed constants. Please box your answers. Good Luck.
Page 2 Page 3
Page 4 5 Page 5 __ Total /100 1: A wire with a current lies near a bar magnet as shown. The current is fairly long but
only a short segment of it is shown so the diagram isn’t too large. Is there a net force on
the current? Explain. Is there a net torque on the current? Explain. You must also draw the magnetic ﬁeld created by the bar magnet. 14 points. lay RHR lie Currcnl Eelfon Envoyagree. Since 5 gal: weaker {Latter 70min ‘llc
NOjfxEj—l ‘Hyn Pail 01a I Clo'ie ‘fa‘llkf i ’ﬁrfef‘POFCé’ SO ll‘c @wifc LUOUZQ Magnet "been 0: aka ‘l’ll‘l Q‘S [Jr MouCSﬁsoyéS “hfxcre [Ia ‘lbrqucifs
we} . 2: Three light bulbs are arranged as shown. Assume that R3 > R0 > RA. Rank the
brightness of the bulbs. Explain. 12 points. P: VQ/K V i5 largeS‘YLPor
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PM [3‘ £0 PA MuCl'hllafgéﬁt E ' 3:7 A is He lon‘gkfcd' + P;IDK I5 :1]: (ﬁe); are {n S‘CiiéS) 0W9 EE>PC Se “ “ lowlC is
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B C a "H4 lCan+C§+ ‘ (.1 'EKQO TQM aSSUMHmj‘ 'l‘lﬂ [power 3n EV (r5 twidd— 3: In this circuit R1 = 109, R2 = 209, R3 = 129, R4 = 89 and 62 = 150V. A student
: analyzes the circuit andmakes the following statement: “IOUOJr of energy is delivered to R4
every 53 and £1 = 100V”. Determine if the student is correct or not. 25 points. DE
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(DC YOU aSCONV" é, =I00 V/ 'H’Wn Ex; only 663 gin gs) 4a: Part of a complete circuit is shown here. If Cl is storing 0.00625J of energy, deter
mine the magnitude of the potential diﬁerence between points A and B. Use CI = 20uF,
02 = IOpF, R1 = 1009 and R2 = 509. 24 points. b: Is it possible to determine which point (A or B) is at the higher voltage? If it is, do so.
If it is not then tell me what additional information you would need about 01. 5 points. n0 ll 5 “0+2 You N389 l3 their) UJlﬁlcj’l 311260106!
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1+” Ital1t $ch Est/ﬂan UNUB = +s’ol/ 5: You have two circuits like the one shown. Each has the same battery, the same resis
tor and a parallel plate capacitor made from two plates of area A separated by a distance
‘ d. The only diﬁerence is that in one of the circuits, there is a dielectric described by n
‘ inserted between the plates. You simultaneously close the switch in each circuit. In which
circuit does the capacitor get close to its maximum charge more quickly? Explain. 12 points. memtam K walhou‘l' M71
Z‘: RC SO ‘Z: i5 Maﬁa” Pb! WCiFrwN‘l—Ni% _ f j? diClEC‘l’FIC Sc Fl will fold longer 1? gctnemﬂ—a—ﬁ r_________.____._______ If (3941:14de H: KG‘FmolVJI‘l’laﬁ‘iltgﬂ 010:1:le .1 + a, z 6 I?
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Self 10C yehﬁiﬁ‘l‘M‘l‘ély 98+ more. (D 191' g‘l‘pp‘l our H1 Hegel/11?]. 15%, torrehl‘Mufl y'ﬁ Three charges of equal mass) are given the initial velocities shown. The ch ge with ‘HM MC
the horizontal velocity in the left picture is +q, the charge with the vertical velocity in the '
left picture is —q, and the charge in the right picture is +q. The lengths of the vectors in each case describe the magnitude of their initial velocities. Draw qualitatively correct paths for each. You may assume that each stays in the region which has the magnetic ﬁeld. Feel free to explain your drawings if you feel that they may not be perfectly clear. 12 points. 0 0 9 0 XXXXXXXX
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